So, if you have an annual pass, and you're the type to love Disneyland, then go to Fantasyland on a weeknight. Personally, I've seen more couples get engaged at Snow White's Wishing well then any other place. The mood is just right, couples sitting next to eachother in the dark, and some passing by just to drop a penny in the well. Also, you can usually squeze an extra half hour past closing, since the security has to clear out frontierland, etc.
Pros: night, gr8 4 couples, Romantic
Cons: Kids during the day